Sodium MethylParaben powder, E219, CAS no.5026-62-0, is the sodium salt of Methylparaben, manufacturing process via chemical synthesis. Hydroxybenzoic acid, methanol and sodium hydroxide as the raw materials. Function: anti-fungal and preservative. Sodium Methylparaben is a water-soluble antiseptic mainly used as a safe, high efficiency, broad-spectrum antibiotic for cosmetics. Sodium Methylparaben is in the preservatives paraben family with methylparaben, propylparaben, butylparaben, and ethylparaben used in the feed, food, pharmaceutical, cosmetic and personal care product industries. As an experienced Sodium MethylParaben manufacturer and supplier, we has been supplying and exporting Sodium MethylParaben for almost 10 years, please be assured to buy from us. Any inquiries about price and the market trend please feel free to contact us, we will reply you within 1 working day. Sodium MethylParaben food grade Specification ITEM STANDARD RESULTS Appearance White crystalline powder complies Purity (on dry base)% 98.0-104.0 99.4 PH value(0.1%water liquor) 9.5-10.5 9.8 Sulfate(ppm) 300
ESS 215KW Lithium Battery Energy Storage System 384VDC Rechargeable Lifepo4 Battery pack 280AH Energy Storage Battery 1. High energy density, small footprint, short construction period, strong environmental adaptability 2. Standardized components, modular architecture, easy for expansion 3. Battery module within the layered stack design, with more than 10 years of long design life 4. Efficient battery module and system cooling design 5. The use of international advanced IGBT and intelligent power module, with high power fast adjustment capability 6. BMS battery management system with SOC automatic calibration and high current active balance function, combined with the perfect operation control and management strategies to achieve accurate and efficient management 7. The combination of software and hardware protection, with alarm protection and automatic diagnostic functions, improve the protection strategy to ensure safe and efficient operation of the system 8. Our BMS use NXP(USA) automotive-grade high performance chip, strong anti-interference, good reliability, wide temperature range. 9. We use brand new high quality A-grade battery power cell, longer service life. 10. Charging and discharging are controlled separately, more convenient and reliable to control charging and discharging. 11. Big color LCD touch screen display, easy setting and operation. 12. Can built in solar charge controller and AC-DC charger, our BMS can intelligently manage charger to charge battery well, BMS can communicate well with battery, solar controller, ac charger and inverter, one integrated intelligent monitoring system. 13. Approved by UL1741 certificate. 14. Accept customized product, our lithium battery system are widely used in many situations, such as: Different residential home, hotel, shop, factory, hospital, commercial buildings, electric car, RVs, Van, mobile dining car, heavy truck, different ship/boats, ice-cream car, outdoor camper,.etc. Applications: 1.Energy Storage --Solar-Wind Power System / City Grid (On/Off) / Community and Family 2.Back-up System and UPS --Telcom Base / CATV system / Computer Server Center / Medical Instrumnt / Military Equipment 3.Other Applications --Security and Electronics / Mobile POS, Mining Lihgt / Torch / LED Light / Emergency Light --RV Motorhome /Golf Carts Battery / Boat Marine Yachts / Electric Skateboard / Electric bike / Electric Scooter / Electric bicycle --LED Backup / Engine Starting Battery,etc.
ESS 215KW Lithium Battery Energy Storage System 384VDC Rechargeable Lifepo4 Battery pack 280AH Energy Storage Battery 1. High energy density, small footprint, short construction period, strong environmental adaptability 2. Standardized components, modular architecture, easy for expansion 3. Battery module within the layered stack design, with more than 10 years of long design life 4. Efficient battery module and system cooling design 5. The use of international advanced IGBT and intelligent power module, with high power fast adjustment capability 6. BMS battery management system with SOC automatic calibration and high current active balance function, combined with the perfect operation control and management strategies to achieve accurate and efficient management 7. The combination of software and hardware protection, with alarm protection and automatic diagnostic functions, improve the protection strategy to ensure safe and efficient operation of the system 8. Our BMS use NXP(USA) automotive-grade high performance chip, strong anti-interference, good reliability, wide temperature range. 9. We use brand new high quality A-grade battery power cell, longer service life. 10. Charging and discharging are controlled separately, more convenient and reliable to control charging and discharging. 11. Big color LCD touch screen display, easy setting and operation. 12. Can built in solar charge controller and AC-DC charger, our BMS can intelligently manage charger to charge battery well, BMS can communicate well with battery, solar controller, ac charger and inverter, one integrated intelligent monitoring system. 13. Approved by UL1741 certificate. 14. Accept customized product, our lithium battery system are widely used in many situations, such as: Different residential home, hotel, shop, factory, hospital, commercial buildings, electric car, RVs, Van, mobile dining car, heavy truck, different ship/boats, ice-cream car, outdoor camper,.etc. Applications: 1.Energy Storage --Solar-Wind Power System / City Grid (On/Off) / Community and Family 2.Back-up System and UPS --Telcom Base / CATV system / Computer Server Center / Medical Instrumnt / Military Equipment 3.Other Applications --Security and Electronics / Mobile POS, Mining Lihgt / Torch / LED Light / Emergency Light --RV Motorhome /Golf Carts Battery / Boat Marine Yachts / Electric Skateboard / Electric bike / Electric Scooter / Electric bicycle --LED Backup / Engine Starting Battery,etc.
Chlorinated paraffin Basic information Product Name: Chlorinated paraffin CAS: 106232-86-4 MF: C24H44Cl6 MW: 0 EINECS: 264-150-0 Chlorinated paraffin Chemical Properties density 1.16 FreezingPoint -30 CAS DataBase Reference 106232-86-4 COA Items Specification Appearance pale yellow to yellow oily viscous liquid Freezing point < -20 C Density 1.22-1.26 Assay% 50+/- 2 Thermal stability index 175C, 4h chlorine nitrogen (10L / h) HCL% 0.1 Conclusion Accords with the enterprise standard
MPPT Solar charge controller Feature 1. We choose high speed and high performance 32-bit processor with excellent EMC design 2. Advanced MPPT tracking algorithm, the tracking efficiency more than 99% 3. High performance IGBT power module as electronic switch, there is no any mechanical switch, plus multiphase synchronous rectification technology, improves the stable greatly 4. Ultrafast maximum power point tracking speed to ensure tracking efficiency 5. Accurate identification and tracking of multi-peak maximum power points 6. With current-limiting charging function, charging current can be set, friendly and compatible with various capacity batteries. 7. Widely PV arraysâ?? voltage input, this can save the cost of PV combiner box, wires and construction 8. Full enclosed duct design and high-speed fan for cooling makes the controller suitable for various harsh environment 9. It shows the ambient temperature. It also has automatic temperature compensation function and RTC real time function 10. The perfect battery protection function and multi-stage charging improves battery life 11. It has the statistical function of generating capacity which is very convenient for customers to view the daily, monthly and total charging capacity of the controller. 12. Complete menu display and operation, plus the humanized design of browsing interface, these makes the operation more easy 13. It can work with GEL. LEAD-ACID, LITHIUM and other type battery 14. Twice protection function to protect battery from damage when the power switch is down (optional) 15. Standard Modbus communication protocol for RS-485 or GPRS communication to extend the communication distance (optional function)
Product Features: 1 All-in-one design, high integration and space saving installation 2 Using high-performance lithium iron phosphate cells, laser welding, good cell consistency, designed service life of more than 10 years 3 Charging and discharging are controlled separately, which is convenient and reliable to control charging and discharging. The discharge port will not be disconnected when over-charging, and the charging port will not be disconnected when over-discharging, the system has good stability 4 Master-slave mode, passive equalization, can manage the equalization resistance, can set the equalization start voltage difference, and monitor the equalization resistance temperature, more intelligent and safe, and reduce the impact of barrel effect on system energy storage 5 BMS adopts NXP(USA) automotive-grade high-performance chips, with strong anti-interference, good reliability and wide temperature range 6 CAN2.0 communication interface, has the advantages of strong real-time performance, long transmission distance, strong anti-electromagnetic interference ability 7 System parameters can be set through the host computer, such as fan start/stop temperature, charger maximum current setting, charge and discharge current correction, SOC correction, with insulation leakage detection function to prevent oil leakage and short circuit of the cell 8 Integrate Solar charge controller or AC charger optional, BMS communication control, more safe and reliable; 9 Cell temperature management, can be automatically controlled with the air conditioner heater according to the cell condition to make the cell works at the most suitable temperature, and can be linked with the fire protection system as needed Performance characteristics 1 Small size and light weight, Maintenance-free 2 Environmental protection and pollution-free materials, no heavy 3 Accurately estimate the state of charge of the battery pack, that is, the remaining power of the battery, to ensure that the power of the battery pack is maintained within a reasonable range 4 Built-in BMS management system with comprehensive protection and monitoring control functions 5 5" LCD screen display, easy to operate, can check the temperature, voltage, working status, discharge current, dynamic and static SOC algorithm of a single cell, local display of alarm info, alarm level distinction, accurate positioning of abnormal cells 6 Main control MCU can be centrally controlled and manage peripheral settings (AC charging module, inverter module, solar charging module) to adjust the charging current and voltage of peripheral devices according to the battery charging curve, making the system more reliable
1 All-in-one design, high integration and space saving installation 2 Using high-performance lithium iron phosphate cells, laser welding, good cell consistency, designed service life of more than 10 years 3 Charging and discharging are controlled separately, which is convenient and reliable to control charging and discharging. The discharge port will not be disconnected when over-charging, and the charging port will not be disconnected when over-discharging, the system has good stability 4 Master-slave mode, passive equalization, can manage the equalization resistance, can set the equalization start voltage difference, and monitor the equalization resistance temperature, more intelligent and safe, and reduce the impact of barrel effect on system energy storage 5 BMS adopts NXP(USA) automotive-grade high-performance chips, with strong anti-interference, good reliability and wide temperature range 6 CAN2.0 communication interface, has the advantages of strong real-time performance, long transmission distance, strong anti-electromagnetic interference ability 7 System parameters can be set through the host computer, such as fan start/stop temperature, charger maximum current setting, charge and discharge current correction, SOC correction, with insulation leakage detection function to prevent oil leakage and short circuit of the cell 8 Integrate Solar charge controller or AC charger optional, BMS communication control, more safe and reliable; 9 Cell temperature management, can be automatically controlled with the air conditioner heater according to the cell condition to make the cell works at the most suitable temperature, and can be linked with the fire protection system as needed Performance characteristics 10 Accurately estimate the state of charge of the battery pack, that is, the remaining power of the battery, to ensure that the power of the battery pack is maintained within a reasonable range 11 Built-in BMS management system with comprehensive protection and monitoring control functions 12 5" LCD screen display, easy to operate, can check the temperature, voltage, working status, discharge current, dynamic and static SOC algorithm of a single cell, local display of alarm info, alarm level distinction, accurate positioning of abnormal cells 13 Main control MCU can be centrally controlled and manage peripheral settings (AC charger, inverter, solar charger) to adjust the charging current and voltage of peripheral devices according to the battery charging curve, making the system more reliable
Categories Others Qty in 20' FCL 2200kg Min Order 1000kg Origin China Packaging Factory Packaging or Neutral Certificate ISO, Kosher, Halal, BRC CAS No. 60-00-4 HS Code 292121 Specification FCC/USP Ethylenediaminetetraacetic Acid, also called EDTA, CAS No.60-00-4, is a aminopolycarboxylic acid manufactured through chemical synthesis. EDTA is a food additive used as a bleaching fixer for colors and sensitive materials. As an experienced EDTA manufacturer and supplier, we has been supplying and exporting EDTA for almost 10 years. Please be assured to buy from us. Any inquiries about price and the market trend please feel free to contact us, we will reply you within 1 working day. EDTA (Ethylenediaminetetraacetic Acid) Specification ITEMS STANDARD PRODUCT NAME EDTAtetrasodiumsalt; Tetrasodiumethylenediamine tetraacetate APPEARANCE Pure White Crystalline Powder Free Flowing PH 10.5-11.5 Molecular Formular C10H12N2O8Na4 . PACKING Packed in complex bag with plastic inner or kraft bag , 25KG net per bag CHELATE VALUE 210-215 PURITY (ASSAY) 99.10% CHLORIDES (Cl) No more than 0.05% Storage kept in a light-proof,well-colsed,dry and cool place.
Product Name: Sodium metabisulfite CAS: 7681-57-4 MW:190.11 MF:2Na.O5S2 Appearance:White crystalline powder Purity:98% Specification Items Standard Sodium metabisulfite % 98%min Water insoluble % 0.01max Fe % 0.002max As % 0.00006max Heavy Metals(Pb) % 0.0003max PH value 4.0-4.6 Application 1. Used as chromatographic analysis reagent, preservative and reducing agent for dyes 2. Used as bleaching agent, mordant, reducing agent, rubber coagulant 3. Printing and dyeing industry used as dechlorination agent after cotton bleaching, cotton cooking additives. Product packaging
Sodium Carboxymethyl Cellulose, CMC, E466, CAS no. 9004-32-4, appears as a white to cream powder, and has a viscosity of approximately 5-12000 M.pas., 1% water solution, 25, Brookfield viscometer. CMC is a good emulsion stabilizer, thickener, and has excellent freeze, melt stability, can improve product flavor and prolong storage time. Carboxymethyl Cellulose can compound with other food thickeners (Xanthan gum, Guar gum, Sodium alginate, Gelatin, Carrageenan), and have synergistic effect with them. As an experienced Sodium Carboxymethyl Cellulose manufacturer and supplier, we has been supplying and exporting Sodium Carboxymethyl Cellulose for almost 10 years, please be assured to buy from us. Any inquiries about price and the market trend please feel free to contact us, we will reply you within 1 working day. Sodium Carboxymethyl Cellulose Specification Carboxymethylcellulose E No E466 Einecs No 265-995-8 CAS No. 9004-32-4 HS Code 39123100 Items Standards Viscosity (mpa.s) BROOKFIELD LVTD 4# 30rpm (1% in solution) 3000-8000 PH (1% solution) 6.0â??8.5 Degree of substitution 0.70â??0.90 Purity % Min 99.5 Loss on drying Max 10.0 Coliform( MPN/100g) Max30 Salmonella absent/g Heavy metal (Pb) % Max 0.0010 Iron (Fe) % Max 0.02 Arsenic (As)% Max 0.0002 Lead% Max 0.0005
Ferrous Lactate, E585, CAS no.5905-52-2, is a ferrous salt of lactic acid manufactured process through neutralizing lactic acid. Ferrous Lactate is widely used as acidity regulator in food, beverage, dairy product, powder drinks, baby food and bakery. As an experienced Ferrous Lactate manufacturer and supplier, we has been supplying and exporting Ferrous Lactate for almost 10 years, please be assured to buy from us. Any inquiries about price and the market trend please feel free to contact us, we will reply you within 1 working day. Categories Preservatives Qty in 20 FCL 20000kg Min Order 1000kg Origin China Packaging Factory Packaging or Neutral Certificate ISO, Kosher, Halal, BRC E No. E585 CAS No. 5905-52-2 HS Code 291811 Specification FCC/USP Ferrous Lactate Food grade Specification Ferrous lactate 96% .Min Loss on drying 20% .Max Chloride(CI) 0.1% .Max Iron (Fe 3+ ) 0.6% .Max Sulphate(SO 4 ) 0.1% .Max PH 5-6 Lead 1 ppm.Max Arsenic 3 ppm.Max
Product: EDTA (Ethylene Diamine Tetraacetic Acid, EDTA Acid, Editic Acid) Molecular Formula: C10H16N2O8 CAS NO.:60-00-4 Molecular Weight:M=292.2 Feature: EDTA is a white crystal powder,insoluble in common organic solvents,soluble in boiling water 160 times as much and in alkali solvents like sodium hydroxide. At 150 C, it shows the tendency to depart from carboxyl. Melting point: 240C(decomposition) Dissolving degree in water: 0.5g/L(25C). Specification Item Specification Appearance White powder Purity,% 99.0min Chloride(Cl) content,% 0.05max Sulfate(SO4) content,% 0.05max Iron(Fe) content,% 0.001max Heavy metal(Pb),% 0.001max Chelate value(mg CaCO3/g),% 260min PH value 4.0-5.0
Potassium Bitartrate, E336,CAS no.868-14-4, food acidulent, a potassium salt of L-tartaric acid, also known as potassium acid tartrate and cream of tartar in cooking, colorless crystals or white crystal powder. As an experienced Potassium Bitartrate manufacturer and supplier, we has been supplying and exporting Potassium Bitartrate for almost 10 years, please be assured to buy from us. Any inquiries about price and the market trend please feel free to contact us, we will reply you within 1 working day. Potassium Bitartrate powder Specification Item Index Content % 98.0~103.0 Identification A,B,C passed Acidity or alkalinity passed Loss on drying %(105C) 2.7 Arsenic % 0.15 Plumbum (Pb) % 0.04
Disodium Pyrophosphate,E541, CAS no.7758-16-9, is a popular leavening agent used in baking powders. available as WHITE POWDER. Disodium Pyrophosphate is widely used as food buffering and chelating agent in food processing. As an experienced Disodium Pyrophosphate manufacturer and supplier, we has been supplying and exporting Disodium Pyrophosphate for almost 10 years, please be assured to buy from us. Any inquiries about price and the market trend please feel free to contact us, we will reply you within 1 working day. Disodium Pyrophosphate Specification ITEM STANDARD Na2H2P2O7 95.0% MIN APPEARANCE WHITE POWDER WATER INSOLUBLE 1.0% MAX ARSENIC( AS) 3PPM MAX LOSS ON DRYING 0.5% MAX CADMIUM (PPM) 1 MAX LEAD (PPM) 4 MAX MERCURY (PPM) 1 MAX HEAVY METAL( PB) 15PPM MAX FLUORID( PPM) 10 MAX PH VALUE 3.5-4.5
Potassium Metaphosphate, E341, CAS no.7758-87-4, also known as MKP, appears as a white powder or granular, odorless, slowly soluble in water, potassium salt of phosphoric acid. As an experienced Potassium Metaphosphate manufacturer and supplier, we has been supplying and exporting Potassium Metaphosphate for almost 10 years, please be assured to buy from us. Any inquiries about price and the market trend please feel free to contact us, we will reply you within 1 working day. Potassium Metaphosphate Specification ITEM STANDARD APPEARANCE WHITE POWDER CONTENT(As P2O5),% 59 61.0 As, % 0.0003max. HEAVY METALS % 0.0015max. Pb,% 0.0002 max Hg,% 0.0001 max Cd,% 0.0001 max VISCOSITY 6.5 15 F, % 0.001max LOSS ON DRYING % 5.0max
Betaine, other name, trimethylglycine, CAS No.107-43-7, available as white Crystals or crystalline powder. Betaine is widely used as nutritional supplements. Betaine is available in Betaine Anhydrous and Betaine Monohydrate form. As Betaine Manufacturers, Suppliers and Wholesalers in China, we supply food and feed grade Betaine. As an experienced Betaine manufacturer and supplier, we has been supplying and exporting Betaine for almost 10 years, please be assured to buy from us. Any inquiries about price and the market trend please feel free to contact us, we will reply you within 1 working day. Betaine Specification Items USP30 Feed Grade Feed Grade Content ,% 98.0-100.5 98.0 95.0 Loss on drying ,% 0.5 2.0 2.0 Heavy metalsPb,% 0.001 0.001 0.001 As,% 0.0002 0.0002 Residue on ignition,% 0.1 pH1+4 aqueous solution 0.8-1.2 Anti-caking agent 0 0 3.0
ButylParaben, E209, CAS no.94-26-8, food and cosmetic antioxidant/preservative, manufacturing process via chemical synthesis, 4-hydroxybenzoic acid (Paraben) and 1-butanol as raw materials. ButylParaben used as an antifungal agent in food active against molds and yeasts, and less active against bacteria. Butylparaben is in the paraben family (Ethylparaben, Methylparaben Propylparaben) of preservatives used by the food, pharmaceutical, and personal care product industries. As an experienced ButylParaben manufacturer and supplier, we has been supplying and exporting ButylParaben for almost 10 years, please be assured to buy from us. Any inquiries about price and the market trend please feel free to contact us, we will reply you within 1 working day. ButylParaben powder Specification ITEM SPECIFICATIONS Preperty: White crystalline powder Content %: 99.0 Melting Point C: 67-72 Loss in dry,% 0.5 Acid degree: qualified Sulfate (counted by SO42-),% 0.024 4-Hydroxybenzoic acid and Salicylic acid Qualified AS,%: 0.0003 Heavy metal (count by Pb),%: 0.001 Remain in burning % 0.1
Calcium Propionate, E282, CAS no. 4075-81-4, manufacturing process by chemical synthesis, calcium hydroxide and propionic acid as raw materials. Calcium Propionate is used in bakery products as a mold inhibitor like Sodium Propionate, keeps bread and baked goods from spoiling by preventing mold and bacterial growth. Properties as an anti-fungal agent, to reduce sodium levels in the diet. Calcium Propionate used in bread, other baked goods, processed meat, whey, and other dairy products in food industry. As an experienced Calcium Propionate manufacturer and supplier, we has been supplying and exporting Calcium Propionate for almost 10 years, please be assured to buy from us. Any inquiries about price and the market trend please feel free to contact us, we will reply you within 1 working day. Calcium Propionate food grade Specification ITEM STANDARD Appearance White Powder Assay 99.0 ~ 100.5% Loss on Drying 4% Acidity and Alkalinity 0.1% PH (10%Solution ) 7.0-9.0 Insoluble in Water 0.15% Heavy Metals (as Pb) 10 ppm Arsenic (as As) 3 ppm Lead 2 ppm Mercury 1 ppm Iron 5 ppm Fluoride 3 ppm Magnesium 0.4%
Sodium Tripolyphosphate, E451, CAS no.7758-29-4, a sodium salt of Phosphoric Acid, white granular or powder, water soluble, the sodium salt of the polyphosphate penta-anion. Sodium Tripolyphosphate functions as a binder, stabilizer, and sequestrant, commonly used in cake mixes, meringues, juices, hams, peas, lima beans, cured pork, sausages, and algin desserts. As an experienced Sodium Tripolyphosphate manufacturer and supplier, we has been supplying and exporting Sodium Tripolyphosphate for almost 10 years, please be assured to buy from us. Any inquiries about price and the market trend please feel free to contact us, we will reply you within 1 working day. Sodium Tripolyphosphate Specification ITEM STANDARD ASSAY (%) (Na5P3O10) 95 MIN APPEARANCE WHITE GRANULAR P2O5 (%) 57.0 MIN FLUORIDE (PPM) 10MAX CADMIUM (PPM) 1 MAX LEAD (PPM) 4 MAX MERCURY (PPM) 1 MAX ARSENIC (PPM) 3 MAX HEAVY MENTAL (AS PB) (PPM) 10 MAX CHLORIDES (AS CL) (%) 0.025 MAX SULPHATES (SO42-) (%) 0.4 MAX SUBSTANCES NOT DISSOLVED IN WATER (%) 0.05 MAX PH VALUE (%) 9.5 â?? 10.0 LOSS ON DRYING 0.7% MAX HEXAHYDRATE 23.5% MAX WATER-INSOLUBLE SUBSTANCES 0.1% MAX HIGHER POLYPHOSPHATES 1% MAX
Sodium Propionate, E281, CAS no.137-40-6, a white crystalline solid or powder that is the sodium salt of propionic acid. Sodium Propionate manufacturing process via chemical synthesis of propionic acid and sodium carbonate or sodium hydroxide as raw materials. Sodium Propionate is used in the food and beverage industry as a preservative. It prevents the growth of mold and some bacteria, thereby prolonging the shelf life of packaged baked goods. Used as a mold inhibitor in bakery products, such as breads, yogurts, soups, drinking yogurts, canned vegetables, etc. As an experienced Sodium Propionate manufacturer and supplier, we has been supplying and exporting Sodium Propionate for almost 10 years, please be assured to buy from us. Any inquiries about price and the market trend please feel free to contact us, we will reply you within 1 working day. Sodium Propionate powder Specification Product Sodium Propionate CAS 137-40-6 INS 281 Structure Molecular formula C3H5NaO2 Properties White crystals, particles or crystalline powder;Odorless or slightly ethyl butyrate smell.1g of this product can be dissolved in 1ml of water,25 or 24 ml of ethanol. Quality Specification Standard Item GB25549-2010 BP2012 FCCV USP35 EP7.0 Content dry basis 99.0%~100.5% 99.0%~101% 99.0%~100.5% 99.0%~100.5% 99.0%~101% Loss on drying (Vol. 4) 1.0% 0.5% 1.0% 1.0% 0.5% Water-insoluble matter Clear, olorless Clear, olorless PH 10 7.8~9.2 7.8~9.2 As(as As203) 3 mg/kg Heavy metals (as Pb) 4 mg/kg 10ppm 2 mg/kg 0.001% 10ppm Fe 0.003% 10ppm 0.003%10ppm Alkalinity (Na2CO3) passed test 0.15% passed test